Wiktionary
unmaternal
a. Not maternal; not befitting a mother.
Usage examples of "unmaternal".
That dew into the utmost wildernesses In wandering clouds of sunny rain that thawed The unmaternal bosom of the North.
Mother Maryelle who was elbowing Sara out of the way in a conspicuously unmaternal manner so that she could peer out of the window.
And how much he owed her for pointing out to him perpetually where the weaknesses lay within him-not to mention for giving him some wonderfully worldly and unmaternal advice.
Frost seemed to invite mothering, even from the decidedly unmaternal Rizzoli.